<html>
<head>
<title>file test</title>
<script>
window.onload=function(){
    var files = document.getElementsByTagName('input'),
    len = files.length,
    file;
    for (var i = 0; i < len; i++) {
        file = files[i];
        if (file.type !== 'file') continue; // 不是文件类型的控件跳过
        file.onchange = function() {
            var _files = this.files;
            if (!_files.length) return;
            if (_files.length === 1) { // 选择单个文件
                var xhr = new XMLHttpRequest();
                xhr.open('POST', 'http://localhost:3000/upload');
                var filePath = files[0].value;
                xhr.setRequestHeader('file-name', filePath.substring(filePath.lastIndexOf('\\') + 1));
                xhr.send(_files[0]);
            } else { }
        };
    }
};
</script>
</head>
<body>
    <input id='file1' type="file" />


    <!-- <form action="/upload" method="POST">
        <input type="file" name='file'>
        <input type="text" name='name' value='abc'>
        <input type="submit" name='upload'>
    </form> -->


</body>
</html>